Mold and its method of construction for paper-making machines



Jan. 13, 1931. J. 5. LITTLE 1,783,531

MOLD AND ITS METHOD OF CONSTRUCTION FOR PAPER MAKING MACHINES Filed Oct. 20, 1928 h yen/0 J0/7/7 5' [077a Patented Jan. 13, 1931 UNITED ,STATES PATENT OFFICE JOHN SHIRLEYLITTLE; or LA GRA GE, ILLINOIS, AssIGNori T0 WESTERN manc'rmc COMPANY, INCORPORATED, or NE YORK, N; Y., A conronarron or NEW YORK J MOLD AND ITS METHODOF CONSTRUCTIONFOR PAPER-MAKING MACHINES Applidation filed October 20, 1928. Serial No.'313,663. i

molds for use in the application of pulpous' material to cores in strand form.

In building cylinder molds for use in apparatus of the type described, it has been the practice in some instances to encircle the drum of the mold at spaced points with strips of a material which would be, impervious to water. These strips called dams or deckles, being impervious, act as a means for defining the edges of the pulp ribbons which are formed on the foramin-ous surface of the drum as it is rotated and subjected to the pulp mixture. Various materials have been employed in these strips and various methods have been used in attaching the dam to the drum, one used having been okonite or electricians tape which was secured to the drum in parallel strips and which was fastened thereto by reason of its own adhesive properties.

Objects of this invention are to provide a mold having accurately defined areas of different character, which is inexpensive, yet which represents a marked improvement in point of utility and durability, and a method of forming such a mold which will be practical, economical, and accurate of result.

In accordance with the features of the invention a member particularly suitable for use in the insulation of electrical conductors with paper pulp is arranged with spaced strips of celluloid forming non-foraminous dams which accurately define the edges of the pulp ribbons, the spaced strips (being atder mold embodying the features of the present invention;

F ig. 2 is an enlarged fragmentary view of the member covering the mold, shown in Fig. 1, showing the method of applying the dams; Fig. 3 is an enlarged fragmentary sectional view taken on the line 3-3 of Fig. 2, and

Fig. 4 is an enlarged fragmentary end view of the mold shown in Fig. 1.

In order tomake clear the steps of tlie method and apparatus with'which it may be practiced, the latter will be described first and more complete details of the method referred to thereafter. For a further detail description of the apparatus for applying and forming the pulpous material on the core, reference should be had to my Patent No. 1,615,394; issued on January 25, 1927.

Referring to-the drawings in which similar parts are designated with identical reference numerals-in the several views, a cylinder mold denoted generally by the numeral 10 is mounted in a framework 11 on a shaft 12 which is journal led in bearings 13. The mold of the drum comprises a plurality of spaced strips 15, preferably consisting of thin celluloid of the type used in photography, although strips of any similar material in the pyroxylin plastic group may be used. These strips may be of any desired width, dependent upon the number and width of the pulp ribbons desired, and the areas between the strips which are composed of wire fabric denoted by the numeral 16. The mold is constructed by mounting in a pair of end spiders 17 and ona plurality of intermediate spiders 18 a plurality of transverse metal rods 19. A spirally wound wire 20 rests upon the transverse rods, encircling the drunf, and supports a coarse wire foundation screen 21. screen 21 and secured thereto by appropriate stitching is a liner screen 22 which constitutes the foraminous surface of the drum. Lo.-

Supported. upon the foundation the bands is variable to permit tightening or removal thereof by the drawing together of flanges 25 and 26 through the cooperation of a threaded bolt 27 and a nut 28. A strip of celluloid 29, is illustrated in Fig. 3, in which the lower portion 30 is shown having been acted on by the acetone or similar solvent, which is the condition of the strip just prior to the application of pressure thereto for causing its close adherence to the screen 22. It is to be understood that applicant is not to be limited by his specification of acetone, since solvents such as ethyl acetate or methyl acetate may be used with generally satisfactory results.

Uniformly accurate results may be obtained by the method embodying the features 'of this invention. In constructing the apparatus, the steel band 24 having parallel edges is applied to the surface of the drum, being so located by rotation thereof that its edges are caused to be perfectly aligned with the guide mark 23 on the frame. After being so positioned, it is secured in place by the bringing together of the flanges 25 and 26 and tightening the bolt 27 and nut 28. By means of a conventional gauge (not shown), a distance is marked off from the right hand edge of the metal band equal to the sum of the desired distance between the celluloid strips and the width of a strip. At that distance there is secured around the drum another steel band which is secured in place in the same manner. An equal distance is gauged from the right hand edge of the second steel band and a third steel band is correspondingly secured around the drum.

A strip of celluloid of a desired width is now applied to the surface of the drum by moistening the under surface of one end thereof by bringing into contact therewith a wick (not shown) which feeds a solvent from a suitable, portable reservoir (not shown), and applying pressure manually to cause the moistened portion to merge with the wire mesh of the screen 22. The solvent-feeding wick is then, with an upward wiping movement on the part of the o erator, brought into contact with the right and edge of the unattached portion of the strip for a distance of approximately two feet. By capillary action the entire under surface of that portion of the strip becomes moistened with the solvent. Pressure is applied to the upper surface of the strip to cause mergence with the fine mesh, care being taken to insure that the left, hand edge of the celluloid strip accurately abuts the right hand edge of the first steel band. The remaining portion of the strip is then moistened for a similar distance in a similar manner and pressure is applied as in the first instance to insure mergence with the mesh of the screen. The process is repeated until a strip is carried completely around the drum and secured to the mesh thereof throughout its entire length. The celluloid strips are previously cut so that upon application to the dam in the manner disclosed, the ends shall perfectly abut. The second celluloid strip is applied in the same manner as the first, and the process continued until the desired number of strips have been applied across the entire width of the cylinder mold drum.

It has been found that, after the application of three strips of celluloid, the first applied has become sufiiciently dry, and the steel band adjacent thereto may be removed and utilized to guide the application of the fourth celluloid strip. Accordingly three steel bands are sufficient as a means application of whatever number of celluloid strips may be required. This is advantageous since the number of pieces of apparatus which are necessary to effect successful use of applicants method are thereby limited.

By carrying the method outlined into effect in a workmanlike manner, a sufficient quantity of the solvent will be applied to the lower surface of the dams to insure that such surface is softened throughout its entire extent, in order that no portion of the band shall be unsecured to the underlying screen. Too much solvent should not be applied to the strips for such would cause an excessive dissolution which would result in rippled edges and an uneven surface. It is, however, believed that by utilizing applicants method as described above, any competent workman can apply the desired number of strips in such manner that each strip will be parallel with the adjacent strip and accurately aligned with the guide mark 23, and will insure the production of pulp ribbons having well-defined edges. Since the opposite ends of the celluloid strips are so laid. as to abut, the seam roduced is hardly noticeable and no in- ]urious effect on the successful operation of the machine or the treatment of the pulp ribbons results therefrom. By the use of celluloid strips in making the dams, and by applying them in the manner above set forth, a

pulp deposit of consistent properties is secured, the celluloid dams have been found to aid in producing pulp strands having the necessary well-defined edges, and experience has shown that when the dams are constructed of celluloid and applied in the manner above set forth, there is no tendency for the dam edges to become frayed so long as the dams remain in use, and the serviceable life of a cylinder mold drum is greatly increased.

It will be understood that the embodiment of the invention herein described and illustrated and the method described is merely a convenient and useful form of the invention which is capable of other modifications without departing from the spirit and scope of the invention as defined in the claims.

. mold drums which consists in clamping about spacing the strips, moistening the under surface thereof, and applying pressure to cause the celluloid strips to engage the screen.

3. A method of applying strips vto a cylinder mold screen which consists in spacing the strips, moisteningthe under surface of the end of a strip, applying pressure to the upper surface thereof to cause the end to engage with the screen, rotating the cylinder mold, feeding the strip, and applying pressure to cause the strip to merge with the screen.

4:. A method of applying damsto cylinder a drum a metal band, securing the end of a celluloid strip to the drum abutting the metal band, revolving thedrum, guiding the celluloid strip as to encircle the drum and lie with edges true with the metal band, softening the under surface ofthe celluloid strip, and applying pressure tothe upper surface thereof to cause engagement of the strip with the screen.

5. A method of applying dams to a cylinder mold drum which consists in moistening the under surface of an end of a celluloid strip, applying pressure to the upper surface to cause engagement of the end with the screen, applying a solvent to the under sur-' face of the remainder of the strip, and applying pressure to the upper surface of the strip while rotating the drum to cause engagement of the strip entire length.

6. A- method ofapplying dams to cylinder mold drums which consists in spacing a strip from the edge of the mold, partially dissolving the lower surface, applying pressure to the upper surface of the strip throughout its entire length, spacing a second strip a predetermined distance from the first, and repeating the operation.

In a mold, a screen, and a celluloid strip thereon.

8. In a mold, a screen, and a non-foraminous celluloid.v strip thereon.

9. In a cylinder mold, a screen, parallel celluloid strips thereon.

10. A' cylinder mold screen comprising alternate foraminous and non-foraminous sections, the non-foraminous sectionsbeing composed of celluloid.

11, A cylinder mold screen comprising alternate foraminous and non-foraminous sections, the non-foraminous'sections bein comand spaced posed of celluloid bands .merged wit the mesh of thescreen. v

with the screen throughout its 12. A cylinder mold screen comprising alternate and parallel foraminous and nonforaminous sections, the foraminous sections being composed of woven wire fabric and the non-foraminous sections being composed of celluloid strips secured to the mesh of the screen.

13. A cylinder mold screen comprising parallel strips of celluloid, and areas of wire screen interposed therebetween, the end of the celluloid strips abutting.

14. A method of applying a dam to a foraminous paper making member, which consists in filling certain of the interstices of the member with a celluloid compound.

15.-In a mold, a foraminous member and celluloid compound filling a portion of the interstices thereof.

16. 'A method of applying a dam to a foraminous paper makin member, which consists in filling certain o the interstices of the member with a pyroxylin plastic compound. I

17. A meihod of applying pyroxylin plastic strips to a cylinder mold screen which consists of moistening the strips with a solvent, and applying pressure to cause the strips to merge with the screen.

'18. In a mold, a screen and a pyroxylin plastic strip thereon.

19. A cylinder mold screen comprising alternate foraminous and non-foraminous sections, the non-foraminous sections beingcomposed of a pyroxylin plastic material.

In witness whereof, I hereunto subscribe my name this 10th-day of October, A. D. 1928.

JOHN SHIRLEY LITTLE. 

